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Fix inheritance description to note that not-null constraints are 

inherited, per Taiki Yamaguchi.
This commit is contained in:
Tom Lane 2006-11-28 01:09:01 +00:00
parent 3cd318a8d1
commit c15de02f61
1 changed files with 6 additions and 6 deletions
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12
doc/src/sgml/ddl.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/ddl.sgml,v 1.68 2006/11/21 03:44:55 momjian Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/ddl.sgml,v 1.69 2006/11/28 01:09:01 tgl Exp $ -->
<chapter id="ddl">
<title>Data Definition</title>
@ -2055,10 +2055,9 @@ VALUES ('New York', NULL, NULL, 'NY');
</para>
<para>
Check constraints can be defined on tables within an inheritance
hierarchy. All check constraints on a parent table are
automatically inherited by all of its children. Other types of
constraints are not inherited, however.
All check constraints and not-null constraints on a parent table are
automatically inherited by its children. Other types of constraints
(unique, primary key, and foreign key constraints) are not inherited.
</para>
<para>
@ -2070,7 +2069,8 @@ VALUES ('New York', NULL, NULL, 'NY');
so that there is only one such column in the child table. To be merged,
columns must have the same data types, else an error is raised. The
merged column will have copies of all the check constraints coming from
any one of the column definitions it came from.
any one of the column definitions it came from, and will be marked not-null
if any of them are.
</para>
<para>